class_docstr: Class which performs validation of the submission.
code: def _verify_submission_size(self):
      submission_size = 0
      for dirname, _, filenames in os.walk(
          self._extracted_submission_dir
      ):
          for f in filenames:
              submission_size += os.path.getsize(
                  os.path.join(dirname, f)
              )
      logging.info("Unpacked submission size: %d", submission_size)
      if submission_size > MAX_SUBMISSION_SIZE_UNPACKED:
          logging.error(
              "Submission size exceeding limit %d",
              MAX_SUBMISSION_SIZE_UNPACKED,
          )
      return submission_size <= MAX_SUBMISSION_SIZE_UNPACKED
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from builtins import int
  import csv
  import json
  import logging
  import os
  import re
  import subprocess
  import numpy
  from six import iteritems
  from PIL import Image
label_desc: Use image node_id 4 for calling the SubmissionValidator obj's underlying member method code with example usage: obj._verify_submission_size() and returns: unknown